Date of Original Version
During July–November 1982, current and temperature records were collected from six current meters spanning the lower 2000 m of the water column on two moorings in the Gulf Stream northeast of Cape Hatteras, N.C. Frequency domain EOF analysis of the velocity cross-spectra reveals that there are two kinematically distinct wave processes present in the subinertial range, identifiable as topographic Rossby wave and meander-associated motions, which are energetically dominant at periods longer than and shorter than 14 days, respectively.
Simultaneous thermocline depth measurements obtained using inverted echo sounders show that the low-frequency topographic Rossby wave motions are uncoupled with near-surface displacements of the Gulf Stream path, but that cross-stream velocity fluctuations in the 14-day and 5-day period bands are associated with vertically coherent meanders of the Gulf Stream temperature front.
Johns, W. E., & Watts, D. R. (1986). Time scales and structure of topographic Rossby waves and meanders in the deep Gulf Stream. Journal of Marine Research, 44(2), 267-290. doi: 10.1357/002224086788405356
Available at: http://dx.doi.org/10.1357/002224086788405356